[Gambas-user] Two more questions about Action

[Benoît Minisini]

Le 29/04/2018 à 11:37, Gianluigi a écrit :
> I am a distracted person and yesterday I was more than usual. :-(
> Now Enabled works, sorry.
> See the attached project
> I doubt if I have understood the meaning of Local
> 
> Regards
> Gianluigi
> 

Yes, it is a bit difficult to explain.

1) When you do Action["xxx"], all controls whose Action is set to "xxx" 
are returned.

2) Action[] takes a second argument that indicated the observer of the 
action. If not specified, all controls associated with that action are 
returned.

3) Action names starting with a point are (almost) just a convention 
that means that they intend to be local to their current event observer 
(usually their form).

4) Actions starting with a point have the same shortcuts as the action 
without the initial point.

5) Control having the same action are supposed to have the same text and 
the same icon. If you don't, the text and the icon of one of the control 
will be used.

Example :

In the IDE, you have a form for editing Gambas source code. You can have 
multiple instances of that form, if you have opened several sources files.

In that form, you have a button to undo the last change. It is 
associated with the ".undo" action.

If you lock the form, the ".undo" action is hidden, but only for that 
form. The undo buttons of the other forms must keep being visible!

1) If I do Action[".undo"].Visible = False, all undo buttons of all 
forms will be hidden.

2) So I have to do Action[".undo", Me].Visible = False in the source 
code of the form (hence Me represents the form, the event observer of 
the toolbar button and the menu entry I want to hide).

3) As the undo action must be hidden in one form only, I name it a 
"local" action. I must start it with a point so that the Action class 
acts correctly.

4) If you change the shortcut of the "undo" action in the shortcut 
configuration dialog, you will see that there is only one shortcut for 
all "undo" action everywhere.

5) You could have a "global" undo action named "undo" too (usually you 
don't. An action is either local or global, like "open-project"). It 
will have the same shortcut than ".undo".

6) See "local" action like a "dynamic variable", and "global" action 
like a "static variable".

I hope things are clearer now.

-- 
Benoît Minisini